Tool for broaching chain-links.



No. 673,747. Patented May 7, I90l. G. G. HOWE.

TOOL FOR BBOACHING CHAIN LINKS.

(Application filed Oct 27 1900.)

(Wu Modal.)

' Ilwrrnn STATES PATENT OFFICE.

GLENN G. HOWE, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE EWART MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS.

TOOL FOR BROACHING CHAIN-LINKS.

SPECIFICATION forming part of Letters Patent No. 673,747, dated May '7, 1901.

Application filed October 2'7, 1900. Serial No. 34,604. (No model.)

To aZl whom it may concern.- ient mode of attachingit is shown in Figs. 2 Be it known that I, GLENN G. HOWE, of Inand 3, in which the bit has at its ends ribs 4,

dianapolis, in the county of Marion and State which fit in grooves in the ends of the openof Indiana, have invented a new and useful ing in which the bit is set and is locked in Improvement in Tools for Broaching Chainplace by a key or wedge 5, driven into regis- Links, of which the following is a full, clear, tering grooves formed on the bit and on the and exact description, reference being had to abutting surface. the accompanying drawings, forming part of In Figs. 4: and 5 I show another mode of this specification, in which attachment, in which the bit has a lateral 10 Figure 1 is a perspective view illustrating shank 5, adapted to fit in a recessed groove a portion of one type of machine and form of on the end of the holderand to be held therein my improved broaching-tool in position. Fig. by a screw 6. 2 is a perspective view of one form of holder In Figs. 6 and 7 I show a third mode of atwith the bit or drift in place. Fig. 3 is a detachment, in which the holder has a movable I5 tached detail perspective View of the drift or section 8, adapted to be fixed by screws to bit shown in Fig. 2, and Figs. 4, 5, 6, 7, 8, and the main holder, which extends back of the 9 are similar views of modified forms of holdsection 3' throughout its entire length, and

ers and bits or drifts for the same. the bit has at its ends tongues or sockets c c, In the manufacture of detachable chainadapted to fit tongues or sockets on the por- 20 links, even when great care is exercised, intions 3 3 of the holder.

equalities are apt'to occur, which when the In Figs. 8 and 9 I show another modificalinks are assembled interfere with the fitting tion of my invention, in which the holder is of the parts,increase the friction of thejoints, made of two sections 3 and 3*, having overand thus impair the usefulness and commerlapping end portions, and both are held to 25 cial value of the chain. To prevent this, I the machine by bolts passing through slots have devised a tool by which the hook por- 7 7. The bit is provided with a conical protions of the links can be broached, freed from jection d at one end and a conical socket d allirregularitiesintheirinterior, and brought at the other, the two sections 3 and 3 being to a standard size and form. -When links are provided with the necessary projection, and

50 thus treated, their uniformity renders them socket shaped to fit the bit. easy to assemble, and when assembled the My tool may be passed through the link chain operates with the least possible friction. while the link is held stationary; but I pre- In Fig. 2 of the drawings I show the broachfer to fix the tool in stationary position and ing-tool made of two parts, a steel bit or drift to push the link over it. This I may effect 5 2 being inserted in an opening in and in line by employing a pusher 8, having a longituwith the link-guiding portion 2, the parts 2 dinal slot shaped in counterpart of the tool, and 2 being held at the side by a holder 3, and I mount the pusher on a reciprocating but being free at both ends, so that the tool head, which causes it to move back and forth can be passed through and beyond the slotted over the tool.

40 opening or hook portion of a chain-link. One The link to be broached is placed between 0 end a of the guiding portion 2 of the tool is the pusher and the tool with its hook on the preferably reduced in thickness and tapers, reduced portion a. The pusher then adso that it may enter the hook easily, and the Vances and pushes the link over the tool and bit 2 is made of hardened steel and is of the beyond the same, and as it passes over the 5 same diameter as that desired for the interior bit 2 the hook is broached and reamed to the of the hook, being of somewhat larger diamstandard diameter. When it passes the end eter than that of the portion 2. of the tool, the link is removed by hand or The bit 2 may be integral with the remainby suitable means. der of the tool 5 but I preferably make it of a To facilitate the motion of the link and to 50 separable and renewable piece. A convenprevent overheating, I prefer to discharge a small stream of oil uponthe tool from a supply-pipe 9.

I claim- 1. A broaehing-tool free at both ends and attached at its side to a holder, said tool being adapted to pass through and beyond the slotted opening of a chain-link or like-article; substantially as described.

2. A breaching-tool free at the ends and having at its middle portion a detachable bit;

substantially as described.

3. A broaching-tool free at both ends, and attached at its side to a holder, said tool having a detachable bit and a guiding portion a of lessdimensions; substantially as described.

4:. A broaching-tool free at both ends, said tool being adapted to pass through and beyond the slotted opening of a chain-link or like article; substantially as described.

In testimony whereof I have hereunto set 20 my hand.

GLENN G. HOWE.

Witnesses:

THOMAS W. BAKEWELL, L. O. HOWE. 

